High Temperature Oxidation Response of Niobium-20 Tungsten-10 Chromium Alloy in Air

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The STO in air at the temperatures between 700 and 1400AdC indicates continuous weight gain up to 1400AdC except for a drop observed from 950 to 1000AdC. However, the alloy completely turns in to powder at 800, 850, 900, and 950AdC temperatures of oxidation in air. XRD on these powders indicate presence of oxides Nb2O5, NbO2, Cr2O5, Cr2O3, WO2, WO3, and NbCrO4. The powder formation during oxidation in air is perhaps due to the formation of WO3 with an extremely high linear expansion coefficient.A Hitachi FESEM 8700 and a Philips Electroscan ESEM 2020 were used to
reveal the microstructures with the aid of both ... Spectroscopy (AES) aamp; X-ray
Photoelectron Spectroscopy (XPS) The Phi 560 ESCA, an ultra high vacuum
system wasanbsp;...

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High Temperature Oxidation Response of Niobium-20 Tungsten-10 Chromium Alloy in Air

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ProQuest - 2008

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